I have a geforce 6200 and everything was working fine until I uninstalled my old drivers and installed new drivers (from the NVIDIA website). Apparently I did something wrong because after I restarted I got something that could only be described as purple static. I quickly booted into safe mode and reinstalled the old drivers. Windows booted fine now, but no Source engine games are working. After asking elsewhere, I realize that I did not use something called a Driver Cleaner. Does anyone have any detailed information/instructions for me on how to use this to get my source games working again?